Donald Trump was welcomed by King Charles III to Windsor Castle Wednesday with a royal spectacle featuring gun salutes, mounted horses and bagpipes as the US president's historic second state visit got into full swing.

The pair laughed and joked as Trump inspected troops at the castle west of London, in an elaborate welcome designed to play into the mercurial American leader's love of pomp and pageantry.

Some 120 horses, and 1,300 members of the British military -- some in red tunics and gold plumed helmets -- feted Trump during a ceremonial guard of honour that UK officials called the largest for a state visit to Britain in living memory.

Heir-to-the-throne Prince William and his wife Catherine warmly greeted Trump and First Lady Melania Trump after the Marine One helicopter touched do

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